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69 carbon steel square bar astm a36 supplier products are offered for sale by suppliers on Alibaba.com, of which steel round bars accounts for 55%, steel square bars accounts for 8%. A wide variety of carbon steel square bar astm a36 supplier options are available to you, such as cutting, bending and welding.You can also choose from aisi, astm and jis carbon steel square bar astm a36 supplier,as well as from hot rolled, cold drawn, and cold rolled carbon steel square bar astm a36 supplier,and whether carbon steel square bar astm a36 supplier is black, or galvanized.